1781-43-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1781-43-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,7,8 and 1 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1781-43:
(6*1)+(5*7)+(4*8)+(3*1)+(2*4)+(1*3)=87
87 % 10 = 7
So 1781-43-7 is a valid CAS Registry Number.